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Washington is limited in its response to North Korea over Sony hack
Dec 19 2014 6:42PM EST | Source: REUTERS TechnologyWASHINGTON/SEOUL (Reuters) - President Barack Obama's threat of a "proportional" response to North Korea's hacking of Sony Pictures shows once more the limits of Washington's options as it seeks to rein in one of the world's most unpredictable and isolated countries.